Test document.currentScript when script is moved during evaluation

In the spec before whatwg/html#5154, `script element's node document` is re-evaluated after script evaluation, and thus if a script is moved to another Document during its own evaluation, `currentScript` of the *new* document could be updated. After #5154, `currentScript` is always set/reset on the same Document, which is expected, and tested so here.
web-platform-tests · Mar 10, 2021 · 4725b23 · 4725b23
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diff --git a/.../semantics/scripting-1/the-script-element/moving-between-documents-during-evaluation.html b/.../semantics/scripting-1/the-script-element/moving-between-documents-during-evaluation.html
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+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>Moving script elements between documents during evaluation</title>
+<link rel="help" href="https://html.spec.whatwg.org/multipage/#execute-the-script-block">
+
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+
+<body>
+<script id="outerScript">
+"use strict";
+
+async_test(t => {
+ const outerScript = document.querySelector('#outerScript');
+ assert_equals(document.currentScript, outerScript);
+
+ const innerScript = document.createElement('script');
+ window.innerScript = innerScript;
+
+ window.innerScriptEvaluated = false;
+ window.anotherDocument = null;
+
+ innerScript.innerText = `
+ window.innerScriptEvaluated = true;
+ const innerScript = window.innerScript;
+ assert_equals(document.currentScript, innerScript,
+ '[1] Before move: currentScript of source Document');
+ assert_equals(innerScript.ownerDocument, document,
+ '[1] Before move: ownerDocument');
+
+ window.anotherDocument = document.implementation.createHTMLDocument();
+ window.anotherDocument.body.appendChild(innerScript);
+
+ assert_equals(innerScript.ownerDocument, anotherDocument,
+ '[2] Just after move: ownerDocument');
+ assert_equals(document.currentScript, innerScript,
+ '[2] Just after move: currentScript of source Document');
+ assert_equals(anotherDocument.currentScript, null,
+ '[2] Just after move: currentScript of destination Document');
+ `;
+
+ document.body.appendChild(innerScript);
+ assert_true(window.innerScriptEvaluated,
+ 'Inner script should be evaluated synchronously');
+
+ assert_equals(document.currentScript, outerScript,
+ '[3] After inner script: currentScript of source Document');
+ assert_equals(window.anotherDocument.currentScript, null,
+ '[3] After inner script: currentScript of destination Document');
+
+ t.step_timeout(() => {
+ assert_equals(document.currentScript, null,
+ '[4] After outer script: currentScript of source Document');
+ assert_equals(anotherDocument.currentScript, null,
+ '[4] After outer script: currentScript of destination Document');
+ t.done();
+ }, 0);
+}, 'Script moved between documents during evaluation');
+</script>